Update on "[ET-VK][13/n] split_with_sizes with more test codegen"

Life is fun when the code-gen is more challenging than writing the operator itself.

1. Test codegen update to include vector of Tensor as output: `Tensor(a)[]`.
2. `aten.split_with_sizes.default`
3. `aten.split.Tensor`
4. Improve `DimUtils` for better dimension reasoning.

Differential Revision: [D56660525](https://our.internmc.facebook.com/intern/diff/D56660525/)

[ghstack-poisoned]

Author: yipjustin

backends/vulkan/runtime/graph/ops/impl/Cat.cpp

@@ -8,8 +8,6 @@
 
 #include <executorch/backends/vulkan/runtime/graph/ops/OperatorRegistry.h>
 
-#include <executorch/backends/vulkan/runtime/api/api.h>
-
 #include <executorch/backends/vulkan/runtime/graph/ops/impl/Copy.h>
 #include <executorch/backends/vulkan/runtime/graph/ops/impl/utils/DimUtils.h>
 #include <executorch/backends/vulkan/runtime/graph/ops/impl/utils/KernelUtils.h>

backends/vulkan/runtime/graph/ops/impl/Split.cpp

@@ -8,8 +8,6 @@
 
 #include <executorch/backends/vulkan/runtime/graph/ops/OperatorRegistry.h>
 
-#include <executorch/backends/vulkan/runtime/api/api.h>
-
 #include <executorch/backends/vulkan/runtime/graph/ops/impl/Copy.h>
 
 #include <executorch/backends/vulkan/runtime/graph/ops/impl/utils/DimUtils.h>